Anchoring for concrete or the like



R. S. PElRCE ANCHORING FOR CONCRETE OR THE LIKE May 16, 1939.

Filed May 1, 1937 m M m Patented May 16, 1939 UNITED STATES PATENT O F Fi-CE ANOHORING FOR CONCRETE OR, THE LIKE Ralph S. Peirce, Hinsdale, Ill.

Application May 1, 1937, Serial No. 140,176

3 Claims.

This invention relates to .anchorings for concrete-or the like, more particularly for anchoring an object to concrete or the like, :or for anchoring two bodies of concrete together.

Among other objects'the invention aims to provide improved means of this type which is simple in construction and operation and Which effects enhanced holding capacity.

The invention .is also inclusive of an improved method for this purpose.

Other objectsand advantages will be apparent from the following description taken together with theaccompanying drawing, in which:

Figure 1 is a sectional view, partially in eleva tion, showing oneiorm of .my improved means;

Figure 2.is.a partial perspective view of the tool shown in Fig. 1;

FigureSis a perspective view in separate relation of a modified formof parts of means shown in Fi 1;

Figure 4 is a perspective view of modified parts shown in Fig. 5;

Figure5 is a sectional view, partially in elevation, including the modification shown in Fig. 4; and

Figure G is a further modification.

Referring in detail to the illustrative embodiments shown in the drawing, the body of concrete ID or the like has a recess I therein, which recess may be formed either at the time the concrete is poured or afterward.

For purposes of anchoring to the concrete an object or another body of concrete l2 for example, the bolt I3 is inserted in the recess H, such bolt being shown in this instance provided at its outer end with the hook termination l4 and at the other end of its shank with the head I5, which as here shown is of frusto-conical formation. As clearly shown in Fig. l, the shank of the bolt is inserted with the head l5 abutting the inner end I6 of the recess II, and encircling the bolt at this point is the expansion device represented by the soft metal cylinder l1 and the harder expanding collar l8. While the collar 18 is of harder metal than the cylinder I! it is desirably not so hard as the metal of the bolt 13 but is adapted to itself flatten out while at the same time expanding laterally the soft metal cylinder I'l upon the head l5 and into engagement with the walls of the recess l I.

The expedients thus far described are conventional, but for expanding the parts l1, l8 just described, I have provided, in accordance with one aspect of my invention, the novel tool l9, preferably of hard steel, the inner end 20 of which is in the form of a slotted tube having a slot 2| therein.

Byreason of the gooseneck 22 the outer end 23 of the tool isoifset from the bolt [3 while at the same time the .tool may receive the blows of the hammer or the like as at 24 propelling its inner end 25 against the collar l8, and thus tamping and setting the expansion device.

By reason of the arrangement just described, the shank of the bolt 13 may carry a second expanding device such as the second cylinder 26 and second expanding collar 21, these being shown in Fig. .1 prior toexpansion.

Afterexpansion of the parts ll, l8 as already described, the tool may be withdrawn from the recess and the cylinder 26, which is also of soft metal, with the expanding collar 21 in contact therewith, may beinserted next into the recess l i. It will be noted that in this instance the expanding .collar 21 is also of frusto-conical formation with itssmaller end 28 received within the counter-bore 29 in the cylinder 26. By means of the d tool 23 or the like, the parts 26, 2'! may then be expanded in the recess H similarly to the parts ll, l3,-the parts 26, 2? thus providing a metallic filler for said recess between the first-mentioned expansion device and the outer end of the recess. This filler may be expanded as described until the expanded outer face of the expanding collar Z'I'is just flush with the outer face 3!] of the concrete body [0.

The projecting hook end Id of the bolt l3 may thereafter afiord securing means for an object attached thereto, or for embedment in an initially plastic body of concrete such as I2 poured adjacent the first body [0.

As shown in Fig. 3, the second expansion device may be in the form of a split sleeve, this being conveniently comprised of the soft metal cylinder 3| and the expanding collar 32 of harder material both of which are split so that they may be inserted on the shank of the bolt l3 after the parts 11, I8 have been expanded, thus eliminating the necessity for the gooseneck in the tool l9 and permitting the use of a straight tool. Preferably when the split sleeves are used, one of these, such as the cylinder 3|, has lugs 33 on each of its segments interengaging with the other segment as by being frictionally received in notches therein to maintain the sleeve parts, and with them the collar parts, together against casual displacement.

As shown in Fig. 4 the split sleeve 34 may have its end 35 reduced in diameter and the segments of the sleeve held together against casual displacement by the thimble 36 which fits over the reduced end 35. This thimble need not be split, 55

as it may be slipped around the hooked end of the bolt l3 after the parts I1, l8 have been tamped.

Instead of the part 34 being of soft metal like the parts I7, 26 and 3|, to be tamped flush with the outer face 30, it may be of cast iron, steel or other hard material, and may thus extend, of substantially equal diameter with the recess ll, across the mating faces 31 of the adjacent bodies of concrete l0 and 12, as shown in Fig. 5. In this instance, the bolt may be a straight bolt 38 having a threaded outer shank 39 upon which the split sleeve 34 and thimble 36, securing the halves of the sleeve together may be placed, and retained in position as by a washer 40 and nut 4| screwed home thereon. It will be understood that this is done before the second body of concrete I2 is poured and that this body is thus molded about the threaded end 39 of the bolt with the parts thereon as described embedded therein, all of these together providing a reinforcement and anchor for the molded body l2. The advantage of extending the hard sleeve 34 or other filler across the mating faces 37 of the adjacent concrete bodies I0 and I2, with a diameter relatively larger than that of the bolt for a substantial distance on each side of these mating faces is that the resistance to shear of the concrete along this mating face is enhanced, with also less tendency for the bolt to work loose in the second concrete body I2.

In place of the split sleeve 34, the split sleeve 42 shown in Fig. 6 may be used. This split sleeve 42 has the part 43, shown in full lines and the part 44 shown in broken lines, each of which comprises a short unbroken cylindrical section, short enough to be turned by the hooked end l4 of the bolt, and each of these sections 43, 44 having integral therewith a longitudinally extending partially cylindrical section, these two partially cylindrical sections mating together to form the complete cylindrical sleeve 42. The complete sleeve 42 like the sleeve 34, may be either of soft lead to be tamped into the recess flush with the face 30 as suggested with reference to Fig. 1, or may be of hard metal to extend across the mating faces 31 as suggested with reference to Fig. 5.

Such changes may be made as fall within the scope of the following claims without departing from the invention.

Having described my invention, I claim:

1. In anchorings for concrete or the like adapted for use with a metallic anchor member having a head received in a recess in the concrete and a protruding portion and having an expansion device expanded on said head within the recess and terminating short of the outer end of the recess, the combination with the shank of said anchor member, of a pair of semi-cylindrical separable sleeve portions adapted to be placed on said shank within the recess after the first expansion device has been expanded, said sleeve portions being of relatively soft metal, and means for expanding said sleeve portions.

2. In anchorings for concrete or the like adapted for use with a metallic anchor member having a head received in a recess in the con crete and a protruding portion having a hook end and having an expansion device expanded on said head within the recess and terminating short of the outer end of the recess, the combination with the shank of said anchor member, of a second expansion device comprising a relatively soft metallic cylinder and a relatively harder expanding collar, said second expansion device being separable from the first expansion device and being adapted to be expanded within said recess after the first expansion device has been expanded.

3. In anchorings for concrete or the like adapted for use with a metallic anchor member having a head portion received in a recess in the concrete and a protruding portion having a hook end and having an expansion device expanded on said head within the recess and terminating short of the outer end of the recess, the combination with the shank of said anchor member, of a second expansion device comprising a pair of semicylindrical separable sleeve portions adapted to be placed on said shank within the recess after the first expansion device has been expanded, and expanded therein.

RALPH S. PEIRCE. 

